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Classification of Aquifers Systems in U.S. Fuller, 1905 Meinzer, 1923 Thomas, 1952 RASA, 1978 Heath, 1984 Heath, 1988 Hydrogeologic Atlas, 1990s. 21 regions, based on bedrock aquifers. Aquifer Regions in U.S. according to Meizner, 1923. Combined and simplified to 10 regions.
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Classification of Aquifers Systems in U.S. • Fuller, 1905 • Meinzer, 1923 • Thomas, 1952 • RASA, 1978 • Heath, 1984 • Heath, 1988 • Hydrogeologic Atlas, 1990s
21 regions, based on bedrock aquifers Aquifer Regions in U.S. according to Meizner, 1923
Combined and simplified to 10 regions Aquifer Regions in U.S. according to Thomas, 1952
28 regions, extensive aquifers that act as single unit, independent aquifers with common characteristics
Summary of U.S. Water Resources, Classification based on watersheds USGS Professional Paper 813
Ground Water Regions (Heath, 1984) 1. Component aquifers—unconfined, confined, multiple 2. Porosity—primary, secondary 3. Aquifer composition 4. Storage and Transmission characteristics
Hydrogeologic Characteristics of Aquifer Regions, Heath, 1984
Aquifer regions in North America. From Heath (1988) in Hydrogeology, Back and others